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Verifying continuous variable entanglement of intense light pulses
O. Glöckl, U. L. Andersen, G. Leuchs
Three different methods have been discussed to verify continuous variable entanglement of intense light beams. We demonstrate all three methods using the same set--up to facilitate…
Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection
Shigenari Suzuki, Masahiro Takeoka, Masahide Sasaki +2
We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne d…
Experimental demonstration of coherent state estimation with minimal disturbance
Ulrik L. Andersen, Metin Sabuncu, Radim Filip +1
We investigate the optimal tradeoff between information gained about an unknown coherent state and the state disturbance caused by the measurement process. We propose several optic…
Experimental purification of coherent states
Ulrik L. Andersen, Radim Filip, Jaromir Fiurasek +2
We propose a scheme for optimal Gaussian purification of coherent states from several imperfect copies. The proposal is experimentally demonstrated for the case of two copies of a…
Demonstration of the spatial separation of the entangled quantum side-bands of an optical field
E. H. Huntington, G. N. Milford, C. Robilliard +5
Quantum optics experiments on "bright" beams typically probe correlations between side-band modes. However the extra degree of freedom represented by this dual mode picture is gene…
Unconditional quantum cloning of coherent states with linear optics
Ulrik L. Andersen, Vincent Josse, Gerd Leuchs
A scheme for optimal Gaussian cloning of optical coherent states is proposed and experimentally demonstrated. Its optical realization is based entirely on simple linear optical ele…